# Power Sum

Discrete Mathematics Level 5

Find $$\displaystyle \sum_{\{a_{1}, \ldots, a_{k}\} \subseteq \{1, 2, 3, 4, 5\}} \frac{1}{a_{1} \cdots a_{k}}$$, where the sum is over all nonempty subsets of of the set $$\{1, 2, 3, 4, 5\}$$.

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